Well First I thought that it could be the usual Capacitor problem in the power circuit but after opening up the TV-Set it turned out that all capacitors on all boards actually "look" perfect. Now I don't have a capacity meter so I can't determine if a capacitor is bad.
You don't need a 'capacity meter' (or even a capacitance one
), it would be of no use - you need an ESR meter, which is the only way to test them.
However, in this case it's not needed, as while you mention the 'usual capacitor problem', there's no such thing on Sony sets, they use higher quality capacitors and they pretty well NEVER fail.
So then I suspected that the florescent lamp could be dead. These actually have a life cycle and the device is kinda 10 Years old or something like that.
But then I noticed that two LEDs (red and green) which are for determining if the TV is on or off start to flicker as soon as one connects the power cable. The ON/OFF button on the device does not change any thing and has no effect.
Here is a photo of the whole circuitry. The LEDs are on the right edge of the screen (Up on the right in the attached photo).
Please, any idea what could be the problem?
What do you mean by 'flicker'? - in common with most sets these ones have a self-diagnosis function, and flash the LED a specific number of times, then stop, then repeat - on these models it goes from 2 flashes to 14.
If it's flickering rather than flashing, then it's probably a PSU problem, and it's not firing up correctly - have you checked the supply rails from the PSU?.
CN6101 pin 2 (3 pin connector) should be 5V, even on standby.
CN6101 pins 1, 2, 5, and 6 should be 14.3V (with the set running only)
CN6102 pins 1, 2, 3, and 4 should be 16.5V (with the set running only) and feed the inverters for the CCFL backlights.
However, you should bear in mind this set is 11 years old, and not even widescreen